"In Windows 8, we reimagined the browser with IE10. We designed and built IE10 to be the best way to experience the Web on Windows. With the IE10 Release Preview for Windows 7 consumers can now enjoy a fast and fluid Web with the updated IE10 engine on their Windows 7 devices. The release preview of IE10 on Windows 7 is available for download today."

There is a reason why h264/AAC is chosen and all the conspiracy theories in the world won't change the fact that it is chosen because it is best fit for the mixture of narrow and wide band connections that exist - from broadband mobile through to cable internet, from ADSL2+ to fibre optic.

I have the plug-in for IE --- which works just fine with IE 10.

But finding a WebM video in the wild is quite the challenge. There doesn't seem to be anything out there but a transcode for YouTube.

There seems to be no such thing as a hardware product --- amateur or pro --- that supports WebM natively. While H.264 hardware is available for every video application you could name.

The final problem is HEVC. The next-generation proprietary codec. There are huge potential savings in bandwidth here for all users and video providers.